Cita APA (7a ed.)

Parker, H. M. D., & Watson, G. (1961). The Roman legions. Heffer & Sons.

Cita Chicago Style (17a ed.)

Parker, Henry Michael Denne, y G.R Watson. The Roman Legions. Cambridge [England]: Heffer & Sons, 1961.

Cita MLA (9a ed.)

Parker, Henry Michael Denne, y G.R Watson. The Roman Legions. Heffer & Sons, 1961.